Storm clouds gather, dark
lightening shoots its spark
of spider veined arcs,
fury portrayed.

Colors cast rainbows,
after storm winds blow,
while tattered skies glow
beauty displayed 

 Cyhydedd hir: is an octave stanza comprised of two quatrains.  The syllable counts are 5/5/5/4/5/5/5/4.  There a couple of different rhyming schemes that can be used.  This poem used the aaabcccb scheme. 

Until next time blessings and healing